1 files changed, 48 insertions, 0 deletions
diff --git a/sed/dateReverser.sh b/sed/dateReverser.sh
new file mode 100755
index 0000000..5936d4b
--- /dev/null
+++ b/sed/dateReverser.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+# Usage: dateReverser.sh [-s SEPARATOR] [-i[BACKUP_SUFFIX]] [FILE]...
+#
+# Reverses the order of dates found in files (dates have the format n-n-n)
+# and prints the result to standard output.
+#
+# With -i makes changes directly in the files instead and creates a backup if
+# BACKUP_SUFFIX is specified.
+# Reads from stdin if no arguments specified.
+
+helpMessage="usage: dateReverser.sh [-s SEPARATOR] [-i[BACKUP_SUFFIX]] [FILE]...
+
+    -s SEPARATOR
+        Uses SEPARATOR instead of \"-\" as date field separator
+
+    -i[BACKUP_SUFFIX]
+        Actually edit files instead of print to standard output
+        Make backup files if BACKUP_SUFFIX is specified"
+sep="-"
+inFile=""
+
+while echo "$1" | grep -q '^-'; do
+	case "$1" in
+		"-s" )
+		sep="$2"
+		if echo "$sep" | grep -q '/'; then
+			sep="$(echo "$2" | sed 's|/|\\/|g')"
+		fi
+			shift 2 ;;
+		"-i"* )
+			inFile="$1"
+			shift ;;
+		* )
+			echo "$helpMessage"
+			exit 1;;
+	esac
+done
+
+for file in "$@"; do
+	if [ -n "$file" ] && [ ! -f "$file" ]; then
+		echo "Error: file $file not found"
+		exit 1
+	fi
+done
+
+sedscr='s/\([0-9][0-9]*\)'"$sep"'\([0-9][0-9]*\)'"$sep"'\([0-9][0-9]*\)/\3'"$sep"'\2'"$sep"'\1/g'
+
+sed $inFile $sedscr "$@"